Rh- Tribes: The Uyghurs of Xinjiang, China

We always hear about religious groups, but little about their genetic ancestries. One example: The Uyghurs of Xinjiang, China. Their Rh- frequencies are 10 times that of the general population of China? We all know their are predominantly Muslim, but did you also know that their ancestors include the Scythian tribe of the Saka?